CLASSIFICATION OF FLOWS BASED ON MACH NUMBER

1. INCOMPRESSIBLE FLOW : 
            MACH NUMBER LESS THAN 0.3 (M<0.3)
2.COMPRESSIBLE SUBSONIC FLOW : 
            MACH NUMBER BETWEEN 0.3 AND 1 (M = 0.3 to 1)
3.TRANSONIC FLOW : 
            MACH NUMBER RANGING BETWEEN VALUES LESS THAN 1 AND GREATER THAN 1 ( M>1 And M <1)
4. SUPER SONIC FLOW : 
            MACH NUMBER GREATER THAN 1 BUT LESS THAN 5 ( M>1 and M<5)
5.HYPERSONIC FLOW :
            MACH NUMBER GREATER THAN 5 ( M>5)

M =MACH NUMBER

MACH NUMBER=INERTIA FORCE/ELASTIC FORCE